NSW Premier Barry O'Farrell has revealed he has met controversial Liberal identity Nick Di Girolamo at 10 functions or events since becoming Premier, including at Wests Tigers football matches, despite telling Parliament only last week he "can't remember the last time I spoke to [him]".

On Thursday, in response to opposition questioning on the issue, Mr O'Farrell claimed the Labor Party had been provided with the information a year ago as part of a freedom of information request.

But Labor says it has no record of this, raising the prospect Mr O'Farrell has misled Parliament twice in a fortnight over the issue.

Mr Di Girolamo, who was chief executive of Australian Water Holdings, a company linked to the family of corrupt former Labor minister Eddie Obeid, is being investigated by the Independent Commission Against Corruption.

Mr Di Girolamo allegedly facilitated "regular payments" to a business owned by a staff member of former resources minister Chris Hartcher.

ICAC will examine allegations that, in return, Mr Hartcher "favoured the interests" of Australian Water Holdings.

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Separately, Mr O'Farrell has been under pressure to reveal the extent of his contact with Mr Di Girolamo over the controversial Wallarah 2 coalmine proposal on the central coast.

In opposition, Mr O'Farrell and Mr Hartcher promised to block the mine, but in government have allowed it to pass through the planning stages. It is now before the Planning Assessment Commission for determination.

Fairfax Media revealed Mr Di Girolamo registered as a lobbyist for the Korean company behind the mine, Kores Australia, in early 2012.

It has since emerged he set about seeking meetings with Mr O'Farrell and Mr Hartcher over the mine.

Mr O'Farrell admitted to Parliament last week he "dropped in" to a meeting between Mr Hartcher and Kores executives attended by Mr Di Girolamo in Februrary 28, 2012 - shortly before Mr Di Girolamo was officially registered as a lobbyist.

Mr O'Farrell insisted he dropped in to the meeting to apologise for not previously being able to meet the president of Kores, despite numerous requests.

He was later forced to correct the parliamentary record after admitting a previously undisclosed meeting request by Mr Di Girolamo.

On Thursday, Mr O'Farrell's office released a list of functions and events also attended by Mr Di Girolamo.

It reveals Mr O'Farrell attended three gala dinners of the Italian Chamber of Commerce - of which Mr Di Girolamo was president - in October 2011, October 2012 and November last year

Mr Di Girolamo was until recently deputy chairman of the Wests Tigers rugby league club.

Mr O'Farrell attended a Wests Tigers match on March 17 last year and a "briefing on Wests Tigers governance issues" on June 12.

On September 4, he attended a Wests Tigers corporate lunch and on October 4 attended the club's grand final lunch.

It has previously been revealed that on May 27, 2011, Mr O'Farrell attended a meeting with Mr Di Girolamo and then finance minister Greg Pearce to discuss Australian Water Holdings.

The meeting was about a $100 million contract with Sydney Water that was subsequently awarded to AWH. The contract is the subject of a separate ICAC inquiry.